Steve Sosnick, chief strategist at Interactive Brokers, cautions that investors in S&P 500 index funds might be more exposed to the AI trade than they realize, with an estimated 40% to 45% portfolio allocation. This is due to the index's market capitalization weighting, where the top seven companies, all heavily involved in AI, account for over 34% of its value. Sosnick also highlights that rising long-term bond yields (10-year Treasury yield near 5%, 30-year yield above 5%) could pressure valuations, urging investors to review their combined AI exposure against their risk tolerance.